Wearing shoe



Jam, 9 R937,

F. SCHAEFER mws'm WEARING SHOE Filed Feb. 5, 1936 WITNESSES Patented Jan. 5, 1937 UNITED STATES PATENT OFFICE.

1 Claim.

This invention relates to wearing shoes which support brake hangers in truck frame brackets, and more particularly to the attachment of such shoes to the brackets.

Brake hangers are generally connected to truck frame brackets through the medium of plates or shoes mounted in the brackets for receiving the wear resulting from movement of the hangers therein. As these shoes are intended to be replaceable when worn, they must be connected to theframe bracket by detachable means. It has accordingly been the practice to provide each shoe and supporting bracket with vertically aligned holes through which a pin extends for looking the shoe in the bracket. Due to irregularities in the sizes of the various holes, the pin is made small enough to go through the smallest hole that is likely to be met, wherefore there is generally enough play between the pin and one or more of the holes to permit the shoe to vibrate in the bracket. This results in the engaging surfaces of the shoe, bracket and pin becoming worn, which permits greater relative movements and consequent greater wear.

It is among the objects of this invention to provide means for detachably looking a wearing shoe in a truck frame bracket in such a manner as to substantially eliminate vibration and wear between their engaging surfaces.

According to this invention a wearing shoe, the inner portion of which is provided with a brake hanger seat, is mounted in the usual manner in a slot in a bracket projecting laterally from a railway truck frame. The upper and lower walls of the bracket slot are provided with vertical openings, .while the portion of the shoe between those openings is provided with a vertical passage offset outwardly relative to the bracket openings. For locking the shoe in the bracket a tapered pin extends through all of these openings in which it engages the outer wall of the wall openings and the irmer wall of the shoe passage, whereby the shoe is tightly wedged against the inner wall of the bracket slot. The pin can then be locked in place in any suitable manner.

The invention is illustrated in the accompanying drawing in which Fig. 1 is a transverse section through the top cord of a railway truck 50 frame, and shows a brake hanger connected to a hanger bracket by a wearing shoe attached to the bracket in accordance with this invention; Fig. "2 is an enlarged fragmentary view taken on the line II-II of Fig. 1; Fig. 3 is a plan view of 55 the wearing shoe wherein a locking pin is shown in section; and Fig. 4 is a View, similar to Fig. 2, showing a modification of the invention.

Referring to Figs. 1 and 2 of the drawing, a bracket I projects laterally from the top of cord 2 of a railway truck frame. The free end of the 5 bracket extends downwardly and is provided with laterally projecting upper and lower parallel walls 3 extending longitudinally of the truck frame and forming a slot 4 open on three sides. This slot is for the purpose of receiving the upper 10 yoke of a brake hanger 5, the arms of which normally incline to the right as viewed in Figs. 2 and 4, rather than being in a vertical plane. To prevent the hanger from wearing the bracket, 21. wearing plate or shoe 6 is detachably mounted in 5 the slot with its inner end provided with a concave hanger seat I. To aid in centering the shoe in the slot and to prevent the side arms of the hanger from wearing the bracket, the shoe is preferably provided at the ends of seat 1 with down-turned flanges 8 that overlap the underlying portion of the bracket. To decrease the weight of the shoe, save metal, and make it feasible to punch pin-receiving holes therethrough, its outer portion is originally made 25 relatively long and thin and is then punched and bent upwardly and backwardly to form a U- shape portion for engaging both walls 3 of the bracket. This outer portion of the shoe is preferably strengthened by bosses 9 integral there- 30 with.

In prior wearing shoes the pin-receiving openings through them are in substantially vertical alignment with the openings in the bracket walls so that unless a pin, extending through all of 35 the openings, tightly engages both the bracket and the shoe, there will be relative movement and wear between all three elements. As it is customary to use undersize pins to assure their entering in the openings which vary in size to some 40 extent, the tight engagement just referred to is lacking.

It is a feature of this invention that the shoe and bracket are connected together in such manner as to substantially eliminate vibration between them, and consequent wear. This is preferably accomplished by punching or otherwise forming pin-receiving holes I l, substantially rectangular in horizontal section, in the shoe in such a position that when the shoe is fully inserted in the bracket slot the axis of the passage thus formed in the shoe is offset outwardly relative to the axes of bracket holes l2 Which also are preferably rectangular in horizontal section (Figs. 2 and 3). As a result, when a pin I3 is driven into all of the holes, it engages the inner wall of the shoe holes or passage and the outer walls of the bracket holes.

By using a pin, preferably rectangular in crosssection, one side of which is inclined downwardly and toward the axis of the pin, the wedging effect produced as the pin is driven through the openings forces the shoe tightly against the inner wall of the slot. Preferably, it is the inner face of the pin that is inclined so that the vertical outer face can lie flush against the outer walls of holes l2. The pin-engaging walls of the shoe openings are inclined to the same extent as the contacting face of the pin for flat engagement therewith. Bosses 9 add to the pin-engaging surfaces of the shoe to reduce its wear. If a cotter pin is used it is locked in place by spreading its lower ends apart, and if any play happens to develop between the bracket and shoe it may be taken up by driving the pin farther into the openings and spreading its lower ends farther apart to hold it in its new position.

As no part of the shoe extends across the top of the hanger, the hangers upper yoke is free to be disposed high in slot 4, and the seat-forming portion of the shoe can thus be made thick enough to withstand wear for a relatively long time. Likewise, by offsetting the axis of the hanger yoke inwardly of the bracket slot relative to the axis of the curved inner wall of the slot, the portion of the shoe between the seat and the lower pin-receiving hole II can be thickened to prevent the hanger from wearing away the metal of the shoe to that hole.

In Fig. 4 there is shown a solid pin l6 which is rectangular in cross-section and has an inclined face I! like the cotter pin just described, and for the same purpose. The lower end of this pin is threaded to receive a nut l8 for locking it in place. Disposed on top of the nut is a washer l9 between which and the lower wall of the bracket a spring 2| is compressed for holding the pin tightly in place under all conditions. The nut is prevented from working off the pin by a small cotter pin 22 extending transversely through larger pin l6 below the nut.

A wearing shoe attached to a hanger bracket in the manner disclosed herein is initially wedged in place to prevent vibration and wear between the bracket, shoe and pin. If for any reason the shoe happens to become loose, it can be quickly tightened by driving the tapered pin farther into the shoe. Furthermore, due to this construction, irregularities in the sizes of the pin-receiving openings do not affect the connection.

According to the provisions of the patent statutes, I have explained the principle and construction of my invention, and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the appended claim, the invention may be practiced otherwise than as specifically illustrated and described.

I claim:

The combination with a railway truck frame, of a bracket projecting laterally therefrom and having upper and lower walls forming a lateral slot, a wearing shoe mounted in said slot and provided with a brake hanger seat, said walls being provided with vertical openings therethrough, the portion of said shoe between said openings being provided with a vertical passage therethrough offset relative to said wall openings, a tapered pin extending through said openings and passage for locking the shoe to the bracket, said pin engaging the outer Walls of said wall openings and the inner wall of said shoe passage, the lower end of said pin being threaded, a nut threaded thereon, and resilient means compressed between said bottom Wall and said nut.

FREDERIC SCHAEFER. 

